Israel's Soreq Nuclear Research Center said it had detected the radioactive material in the air, Xinhua reported on Thursday.
The substances are alleged to have reached Israel in the aftermath of the earthquake and tsunami that damaged the Fukushima Daiichi nuclear power plant in central Japan, the center added.
The density, however, is 400,000 times lower than what the amount diffused after the Chernobyl disaster in 1986, thus eliminating any health or environmental risks.
"The public can continue its daily routine as usual," Israel Atomic Energy Commission said in a statement.
Radioactive fallout from the Fukushima disaster has been identified in numerous parts of the world in recent weeks. Moderate concentrations were reportedly found in Siberia, the Pacific and North America.
Low levels of radiation from the explosion have also reached most of the provinces in China, but the concentration was similarly found to be nowhere near the hazardous levels.
Government officials are pleading with the Japanese people and the world to avoid overreaction to what they say are still low-threat levels of radiation away from the plant.
Israel's Negev desert is home to the Dimona plutonium- and uranium-processing facility, at which it is reported to have secretly manufactured scores of nuclear warheads since 1958.